NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Anhydrite EOS and Phase Diagram in Relation to Shock DecompositionIn the context of the Chicxulub impact, it became recently obvious that experimental and theoretical research on the shock behavior of sulfates is essential for an assessment of the role of shock-released gases in the K/T mass extinction. The Chicxulub crater is the most important large impact structure where the bolide penetrated a sedimentary layer with large amounts of interbedded anhydrite (Haughton has also significant anhydrite in the target). The sulfuric gas production by shock compression/decompression of anhydrite is an important issue, even if the size of Chicxulub crater is only half of the so far assumed size. The comparison of experimental data for anhydrite, shocked with different techniques at various laboratories, reveals large differences in the threshold pressures for melting and decomposition. To gain insight into this issue, we have made a theoretical investigation of the thermodynamic properties of anhydrite. The project includes the review of data published in the last 40 years - reasons to study anhydrite cover a wide field of interests: from industrial problems of cement and ceramic production to the analysis of nuclear underground explosions in salt domes, conducted in the USA and USSR in the 1970th.
Document ID
20040065765
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Ivanov, B. A.
(Academy of Sciences (Russia) Moscow, Russia)
Langenhorst, F.
(Bayreuth Univ. Germany)
Deutsch, A.
(Muenster Univ. Germany)
Hornemann, U.
(Ernst-Mach-Inst. Freiburg, Germany)
Date Acquired
August 21, 2013
Publication Date
January 1, 2004
Publication Information
Publication: Lunar and Planetary Science XXXV: Impacts: Modeling and Observations
Subject Category
Chemistry And Materials (General)
Funding Number(s)
CONTRACT_GRANT: DFG-La-830/4
CONTRACT_GRANT: DFG-Ho-1446/3
CONTRACT_GRANT: DFG-De-401/15
Distribution Limits
Public
Copyright
Public Use Permitted.
Document Inquiry

Available Downloads

There are no available downloads for this record.
No Preview Available